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Relief in Chicago: No More 'Frankenfish'  An anxious search Tuesday of a Chicago harbor turned up no more northern snakeheads, a voracious alien fish that can devastate freshwater ecosystems by gobbling up food and native fish.

Scientists Reverse Paralysis in Dogs  Dogs with paralyzed hind legs regained the ability to walk after getting a shot of a chemical cousin of antifreeze that helped repair nerve cells in their damaged spinal cords, scientists reported.